Just because her family has a barn and horses does not mean she knows anything about these particular horses.

As for being in close proximity to cars, there have been three carriage horses that have died as a result of collisions with traffic in the past 30 (that’s THIRTY) years: Chester (1985), Tony (1990) and Spotty (2006).
In addition, the horses do not suffer from respiratory problems. The stables are very well-ventilated and contrary to popular belief the air in NYC is actually quite clean. According to the American Lung Association's "State of the Air" report ( New York County, NY (i.e., Manhattan) has better air quality than Lancaster County, PA (Amish country) or Hunterdon County, NJ.

You are entitled to your opinion that horses don’t belong in the city, but you are not entitled to make stuff up to support that opinion. The bottom line is that the facts do not support her stance. As a matter of fact, the issue has nothing to do with the horses at all – it’s all about money and real estate: